“They do not live in the extreme environments” is the one among the following choices that is a plausible explanation for why bacteria lack ether-linked cell membranes. The correct option among all the options that are given in the question is the third option or option “C”. I hope it has helped you.
The correct answer is- c. They do not live in the extreme environments. Cell membrane ( also called plasma membrane) surrounds the cytoplasm of all cells and separates the internal environment of cell from its external environment. In bacteria, it is composed of phospholipids and many protein. Phopholipids are linked to ester in case of bacterial cell membrane whereas in archaebacteria, they are linked to ether ( that is they are linked to glycerol backbone). The ether linkage in the cell membrane of Archaebacteria forms stable membranes that enable them to survive under harsh environmental conditions such as hot springs, boiling mud surrounding volcanoes, salt lakes, Bacteria do not live under such conditions. Thus, bacteria lack ether-linked cell membranes.
Options are not provided in the question. The complete queston is as following: What is a plausible explanation for why bacteria lack ether-linked cell membranes? Select one a. They need chitin in the cell membranes
b. They exchange fluids with the environment
c. They do not live in the extreme environments
d. They have peptidoglycan in their membrane c. They do not live in the extreme environments
Explanation: The cell wall in bacteria (Gram-negative Bacteria) is made up of a single layer of peptidoglycan surrounded with an asymmetrical lipid bilayer (lipopolysaccharide (LPS) together with a glycolipid) called outer membrane. The cell membrane facilitate solute and protein translocation, as well as signal transduction. Bacteri ado not posses ether-linked cell membrane because ether bonds are more thermostable and functions at high temperature only. In environment bacterial-type, archaeal-type, and mixed-type membrane lipids are majorly found. So, as bacteria do not live in the extreme condition which is a prime requirement for the stability of ether-linked membrane, bacteria lack ether-linked membrane and have lipid membrane. Hence, the correct otpion is c.
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